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J. H. SOHOONMAKER. Lightning Rod.

(No Model.)

No. 243,630. Patented June 28,1881.

ATTORNEYS I UNITED STATES PATENT OFFICE.

JAMES H. SOHOONMAKER, OF \VINONA, MINNESOTA, ASSIGNOR OF FOUR- FIFTHS TOH. D. MORSE AND N. O. GAULT, OF SAME PLACE.

LIGHTNING-ROD.

SPECIFICATION forming part of Letters Patent No. 243,630, dated June 28,1881. Application filed April 30, 1881. (No model.)

To all whom it may concern:

Be it known that I, J. H. SOHOONMAKER, a citizen of the United States,resident of Winona, in the county of Winona and State of Minnesota, haveinvented a new and valuable Improvement in Lightning-Rods,- and I dohereby declare that thefollowin g is a full clear, and exact descriptionof the construction and operation of the same, reference being had to 10the annexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon.

Figure l of the drawings is a representation ofa cross-section of therod. Fig. 2 is a side view.

This invention relates to improvements in lightning-rods.

The invention consists of a rod made up of tubes arranged as hereinafterset forth, and

particularly pointed out in the claim.

In the annexed drawings, A is a central straight tube, about which arewound spirally the smaller tubes B, close together. All of these tubesconsist of a hollow zinc wire, (1,

covered with sheet-copper D. These are the best metals, but either thewire or may be made of any metal.

covering By this construction a rod is formed of great strength anddurability, having good conductivity, and of cheaper cost than ordinary.

Hollow copper wires placed around a straight hollow copper core is notnew. A solid central iron core having an encircling copper sheath andsolid twisted encircling wires is also old; and a lightning-rod made ofan in 5 terior and an exterior copper shell and pro vided with a flatzinc core is also old. Neither of these constructions are claimedhereinafter.

I claim- In a lightning-rod, the combination, with a 40 straight hollowzinc core covered with sheet copper, of a series of twisted encirclingtubes of zinc covered with sheet-copper, substantially as and for thepurposes set forth.

In testimony that I claim the above I have 5 hereunto subscribed my namein the presence of two witnesses.

JAMES H. SOHOONMAKER.

Witnesses:

ALFRED C. DIXON, CALVIN A. BIERoE.

